[gradsusr] regrid data

[Robert Seigel]

Hi Liban, Sam, and Mike,

Thank you for the responses. 

I am currently running opengrads 2.0.1 and still unable to access the regrid2 functions. However, I have figured out a workaround using wgrib2. With wgrib2, I am successfully able to interpolate the NAM grid to the more coarse GFS grid for more objective comparisons. 

Thanks again,
Rob

On Feb 12, 2012, at 4:12 PM, Michael Fiorino wrote:

> Rob and Liban,
> 
> the key point is that re2 and re are not grads scripts but grads
> external functions, i.e., they are external code accessed from within
> grads is if they were built into grads itself.  an example of an
> 'intrinsic' or built-in grads function is 'aave'.
> 
> /*only opengrads2.0 supports external functions like my regrid2 (original
> user defined function for grads 1.X) that is now called 're2' in the
> opengrads2.0*/.
> 
> let me know if you have problems Rob, but it should work if you use
> opengrads2.0.
> 
> also, re2 (using re defaults) does 'appropriate' regriding.  the general
> practice is to use area-average regriding (perserves area averages, or
> what i call 'box averaging', the 'ba' option in re2/re) when regriding
> from fine to coarse grids (e.g., 0.5 deg -> 2.5 deg).  but for coarse ->
> fine Nth order interp is better (re2/re this is 3rd order bessel
> interpolation) re2/re selects the appropriate method that can be
> overridden as needed see:
> 
> re:   http://opengrads.org/doc/udxt/re/
> re2:  http://ruc.noaa.gov/fiorino/grads/re2.txt
> 
> ciao ciao 4 now, Mike
> 
> On 2012-02-10 09:36, Yan Libin wrote:
>> Rob,
>> 
>> You can download OpenGrADS from this link
>> http://sourceforge.net/projects/opengrads/files/grads2/2.0.1.oga.1/Linux/
>> I guess this bundle has regrid function (re2) after you install it.
>> It is not a script under windows platform, so maybe the same under linux platform.
>> After installation, you can do like this:
>> 
>> define var1=re2(var,1,1)
>> d var1
>> 
>> You can have a try.
>> Good luck.
>> 
>> Libin
>> Yan Libin
>> 
>> From: Robert Seigel
>> Date: 2012-02-11 00:28
>> To: zjuyanlibin; GrADS Users Forum
>> Subject: Re: [gradsusr] regrid data
>> I am using a Linux platform with grads-2.0.a9. Is there a linux script?
>> 
>> Rob
>> 
>> On Feb 10, 2012, at 9:26 AM, Yan Libin wrote:
>> 
>>> If you are working on a windows platform, you can download OpenGrADS which has the regrid
> function already.
>>> 
>>> Yan Libin
>>> 
>>> From: Robert Seigel
>>> Date: 2012-02-11 00:22
>>> To: zjuyanlibin; GrADS Users Forum
>>> Subject: Re: [gradsusr] regrid data
>>> Thank you for the quick response, Yan.
>>> 
>>> When I type that, I get the following response from grads:
>>> 
>>> Syntax Error: Invalid Operand
>>> 're2' not a variable or function name
>>> Error ocurred at column 1
>>> DEFINE error: Invalid expression.
>>> 
>>> Do you have a copy of the re2() script?
>>> 
>>> Thanks,
>>> Rob
>>> 
>>> On Feb 10, 2012, at 9:17 AM, Yan Libin wrote:
>>> 
>>>> define varnew=re2(varold,1,1)
>>>> 
>>>> Yan Libin
>>>> 
>>>> From: Robert Seigel
>>>> Date: 2012-02-11 00:15
>>>> To: gradsusr
>>>> Subject: [gradsusr] regrid data
>>>> Hi,
>>>> 
>>>> I am trying to regrid NAM data to match up with GFS resolution. I have seen numerous
> posts regarding regrid2() or re(), however I cannot seem to find any of these scripts. I
> have downloaded a bundle and found regrid2(), but could not get it to work. It gave me
> errors similar to previous posts ('regrid2' not a variable or function name). Does anyone
> have (or know where to find) a script that regrids data to a more coarse resolution?
>>>> 
>>>> Thanks,
>>>> Rob
>>>> _______________________________________________
>>>> gradsusr mailing list
>>>> gradsusr at gradsusr.org
>>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>> _______________________________________________
>>>> gradsusr mailing list
>>>> gradsusr at gradsusr.org
>>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>> 
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>> 
>> 
>> 
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
> 
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr